fixed event/live transition

src/ui_layout.cpp

@@ -232,6 +232,14 @@ void save_layout_now(App& app) {
   // run would silently vanish from the only place it can be picked. Keeping the old file loses
   // nothing: this run configured nothing.
   if (app.model->signals().empty()) return;
+  // A file view is not the source's session, and the same argument applies: this view configured
+  // nothing about the stream. A replay leaves the rows where the user put them, so its save would
+  // merely be pointless -- but a *group* rebinds every slot to its own renamed channels, and a save
+  // taken while one was up wrote `signals = ["square (A)", ...]` into the file. The next load then
+  // matched no live signal, enabled nothing, and the live view came back with no channels at all,
+  // on the window the poisoned file carried. Skipping costs nothing: the live session's own file is
+  // already on disk, and `go_live_again()` puts the rest back.
+  if (app.replaying) return;
   if (app.config_name.empty()) app.config_name = active_configuration(app.source_host,
                                                                      app.source_port);
   const std::string path =